64 lines
1.5 KiB
JavaScript
64 lines
1.5 KiB
JavaScript
import {
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Function as FunctionToken,
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RightParenthesis
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} from '../../tokenizer/index.js';
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export const name = 'FeatureFunction';
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export const structure = {
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kind: String,
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feature: String,
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value: ['Declaration', 'Selector']
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};
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function getFeatureParser(kind, name) {
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const featuresOfKind = this.features[kind] || {};
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const parser = featuresOfKind[name];
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if (typeof parser !== 'function') {
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this.error(`Unknown feature ${name}()`);
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}
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return parser;
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}
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export function parse(kind = 'unknown') {
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const start = this.tokenStart;
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const functionName = this.consumeFunctionName();
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const valueParser = getFeatureParser.call(this, kind, functionName.toLowerCase());
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this.skipSC();
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const value = this.parseWithFallback(
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() => {
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const startValueToken = this.tokenIndex;
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const value = valueParser.call(this);
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if (this.eof === false &&
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this.isBalanceEdge(startValueToken) === false) {
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this.error();
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}
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return value;
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},
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() => this.Raw(null, false)
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);
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if (!this.eof) {
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this.eat(RightParenthesis);
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}
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return {
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type: 'FeatureFunction',
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loc: this.getLocation(start, this.tokenStart),
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kind,
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feature: functionName,
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value
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};
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}
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export function generate(node) {
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this.token(FunctionToken, node.feature + '(');
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this.node(node.value);
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this.token(RightParenthesis, ')');
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}
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